lib/MC/MCAsmInfo.cpp

   1 //===-- MCAsmInfo.cpp - Asm Info -------------------------------------------==//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file defines target asm properties related what form asm statements
  11 // should take.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm/MC/MCAsmInfo.h"
  16 #include "llvm/Support/DataTypes.h"
  17 #include <cctype>
  18 #include <cstring>
  19 using namespace llvm;
  20
  21 MCAsmInfo::MCAsmInfo() {
  22   HasSubsectionsViaSymbols = false;
  23   HasMachoZeroFillDirective = false;
  24   HasMachoTBSSDirective = false;
  25   HasStaticCtorDtorReferenceInStaticMode = false;
  26   LinkerRequiresNonEmptyDwarfLines = false;
  27   MaxInstLength = 4;
  28   PCSymbol = "$";
  29   SeparatorString = ";";
  30   CommentColumn = 40;
  31   CommentString = "#";
  32   LabelSuffix = ":";
  33   GlobalPrefix = "";
  34   PrivateGlobalPrefix = ".";
  35   LinkerPrivateGlobalPrefix = "";
  36   InlineAsmStart = "APP";
  37   InlineAsmEnd = "NO_APP";
  38   AssemblerDialect = 0;
  39   AllowQuotesInName = false;
  40   AllowNameToStartWithDigit = false;
  41   AllowPeriodsInName = true;
  42   ZeroDirective = "\t.zero\t";
  43   AsciiDirective = "\t.ascii\t";
  44   AscizDirective = "\t.asciz\t";
  45   Data8bitsDirective = "\t.byte\t";
  46   Data16bitsDirective = "\t.short\t";
  47   Data32bitsDirective = "\t.long\t";
  48   Data64bitsDirective = "\t.quad\t";
  49   SunStyleELFSectionSwitchSyntax = false;
  50   UsesELFSectionDirectiveForBSS = false;
  51   AlignDirective = "\t.align\t";
  52   AlignmentIsInBytes = true;
  53   TextAlignFillValue = 0;
  54   GPRel32Directive = 0;
  55   GlobalDirective = "\t.globl\t";
  56   HasSetDirective = true;
  57   HasAggressiveSymbolFolding = true;
  58   HasLCOMMDirective = false;
  59   COMMDirectiveAlignmentIsInBytes = true;
  60   HasDotTypeDotSizeDirective = true;
  61   HasSingleParameterDotFile = true;
  62   HasNoDeadStrip = false;
  63   HasSymbolResolver = false;
  64   WeakRefDirective = 0;
  65   WeakDefDirective = 0;
  66   LinkOnceDirective = 0;
  67   HiddenVisibilityAttr = MCSA_Hidden;
  68   HiddenDeclarationVisibilityAttr = MCSA_Hidden;
  69   ProtectedVisibilityAttr = MCSA_Protected;
  70   HasLEB128 = false;
  71   SupportsDebugInformation = false;
  72   ExceptionsType = ExceptionHandling::None;
  73   DwarfRequiresFrameSection = true;
  74   DwarfUsesInlineInfoSection = false;
  75   DwarfUsesAbsoluteLabelForStmtList = true;
  76   DwarfSectionOffsetDirective = 0;
  77   DwarfUsesLabelOffsetForRanges = true;
  78   HasMicrosoftFastStdCallMangling = false;
  79
  80   AsmTransCBE = 0;
  81 }
  82
  83 MCAsmInfo::~MCAsmInfo() {
  84 }
  85
  86
  87 unsigned MCAsmInfo::getULEB128Size(unsigned Value) {
  88   unsigned Size = 0;
  89   do {
  90     Value >>= 7;
  91     Size += sizeof(int8_t);
  92   } while (Value);
  93   return Size;
  94 }
  95
  96 unsigned MCAsmInfo::getSLEB128Size(int Value) {
  97   unsigned Size = 0;
  98   int Sign = Value >> (8 * sizeof(Value) - 1);
  99   bool IsMore;
 100
 101   do {
 102     unsigned Byte = Value & 0x7f;
 103     Value >>= 7;
 104     IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
 105     Size += sizeof(int8_t);
 106   } while (IsMore);
 107   return Size;
 108 }